カリウム二次電池の可逆性デンドライトフリーポタシウムプレッティングと剥離電気化学
Neng Xiao1, William D McCulloch1, Yiying Wu1
1Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States.
Journal of the American Chemical Society
|July 1, 2017
まとめ
充電可能なカリウム金属電池は有望ですが,カリウムアノードは不安定です. 新しいKFSI-DME電解質は安定したカリウム塗装と剥離を可能にし,バッテリーの性能を改善します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- リチウムイオン電池の代替品として 再充電可能なカリウム金属電池が登場しています
- カリウム金属アノードは,高反応性および不安定な固体電解質インターフェーズ (SEI) により,逆転性が低い.
研究 の 目的:
- 安定した電解質を開発し,可逆的なカリウム塗装と剥離を行う.
- カリウム金属アノドの電気化学的安定性を高めるため
- カリウム金属電池の高圧カトドの使用を可能にします.
主な方法:
- カリウムビスフローロスフニルイミド (KFSI) - ディメトキシエタン (DME) の電解質を調査した.
- ポータシウム金属の統一SEIの形成を分析した.
- 5V (vs K/K+) までの電気化学的安定性を試験した.
- プルーシアンブルーの カリウムカソッドで 完全なセルを組み立てた
主要な成果:
- KFSI-DME電解質は,カリウムに均一なSEIを形成し,室温で効率的な (∼99%) リバーシブルプレッティング/ストリッピングを可能にしました.
- 電解質は5Vまで優れた電気化学的安定性を示した.
- プルーシアンブルーの カリウムカソッドが充実した細胞は 期待できる性能を示した.
結論:
- 開発されたKFSI-DME電解質は,安定的かつ効率的なカリウム金属アノドサイクルを促進します.
- この電解質は高電圧の カトドと互換性があり, カリウム金属電池技術の進歩です.
- この発見は,将来のバッテリー開発のためのカリウム電気化学の理解に貢献します.
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